Control system and switch.



H; 1). JAMES. y CONTROL SYSTEM AND SWITGH. APPLICATION FILED DEO.14,190.8. R.

'MTN ESSESr I QVENT OR I I ATTORNEY HENRY D. JAMES, OF PITTSBURG,

TRIO & MANUFACTURING COMPANY, A

coRroRilTIoN OF PENNSYLVANIA.

CONTROL SYSTEM; AND SWITCH.

Specification of Letters Patent.

Patented Aug. 17, 1969.

Application filed December 14, 1908. Seria1No.467,488.

To all whom it may concern:

Be it known that I, HENRY I). citizen of the United of Pittsburg, in thecounty and State of Pennsylvania,

new and useful Improvement in Control Systems and Switches, of which thefollowing is'a specification.

My invention relates to controlling switches and systems for electricaltranslating devices, and particularly to controlling systems andswitches Which are utilized for so controlling electric motors that theymay be started from rest and brought to operating speed automaticallyand under such conditions as to avoid injury to either the motor or thestarting apparatus. I

It has become common ractice to utilize a plurality of unit switc es inconnection JAMES, a

of Allegheny ing and controlling electric motors, and to initiallygovern such switches by means of a manually operated master switch.

My invention pertains to such apparatus, and it has for its object toprovide a simple and efi'ective means wherebythe operation of successiveswitches in a set or series shall be automatically. delayed a suflicientlength of time to prevent such rushes of current to the controlled motoras will tend to cause inury or produce too rapid acceleration.

The single figure of the accompanying drawing is a View,partial-lyinsection, tially in side elevation, and partiallydiagrammatic of a system of control embodyinc my invention.'

eferring now to the details shown in the drawing, a motor 1 issuppliedwith energy from a suitable source through line conductors 2 and 3 and aresistance 4 is provided for insertion in whole or in part mto the motorcircuit during the starting opera tion. a

As here shown, three automatic switches 5, 6 and? are employed, twoofwhich are alike in construction and the third of which differstherefrom in certain particulars which will be hereinafter pointed out.Each of the switches 5, 6 and 7 is provided with an operating magnetcoil or solenoid 8 which is mounted in a suitable frame ,9, and with astationary armature or core member 10 and -\almovable armature or coremember 11, the latter being mounted upon a rod 12 the up-' per end ofwhich is provided with a suitable States, and a resident have invented a1 with a suitable variable resistance in startea as indicated at 25,

par-

contact terminal piece 13 to engage a similar stationary contactterminal piece 14 when the solenoid 8 is energized 1n av manner to behereinafter explained.

Connected to the movable armature or. core member 11 is a movablecontact bridging member 15 which is adapted to engage a pair ofstationary contact terminals 16 and 17 when the movable armature orcore. member is raised. The switch 7 is also provided with a pair ofstationary contact terminals PENNSYLVANIA, A SSIGNOR TO WESTINGHOUSEELEC- 18 and 19 to be engaged by the member 15 when it is in its lowestpositio Located adjacent to the contact terminals 13 and 14 and atopposite sides thereof, are two blow-out magnet coils 20 and 21 intowhich project the upper ends of two armature or core members, the lowerends of which are supported upon tlQe @rame 9. In ch of the switches 5,6 and 7, the armature or core member 22 may be stationary, but the othermember 24 is pivoted upon the frame,

and is provided with" a projection 26 to engage a limiting stop 27 whenit is moved inwardly by the action of the blow-out coils.

The outer side of the upper end of the pivotally mounted armature orcore member 24 is provided with a contact terminal piece 28 in positionto engage a cooperating stationary contact terminal piece 29 when thememher is in its outermost position, it being held in this position whenthe blow-out magnets are denergi'zed, or are energized to less than apredetermined degree, by means of a coilspring 30 the upper end ofwhich-is attached to a lug 31 upon the member 24. The lower end of thespring 30 is adjustably attached to a lug 32 upon the frame 9 in orderthat the tension exerted by the spring may be ad.- justed to meetdesired conditions-of opera tion.

In order to start the motor 1, a master switch 33 is closed manually,thus establishing a circuit from the line conductor 2 through theoperating coil 8 of switch 5 and the auxiliary switch 1518-19 to theline conductor 3. The operating magnet coil 8,--

being thus energized, will raise the movable core member 11 and thusbring the contact terminals 13 and 14 into engagement and also close thecorresponding auxiliary switch 1516-17, thus establishing a circuit fromline conductor 2 through the motor 1, the en tire resistance 4, theblow-out magnet coils and the contact terminals of the switch 5, to theline conductorfi. The volume of current passing through the motor uponthe 1n1t1al closing of the circuit will be suflicient to attract thearmature or core member 24 against the force exerted by the spring 30and thus separate the contact terminals: 28 and 29 to 1 preventenergizing the operating magnet 8 oi the switch 6 until the currentflowing through the motor becomes reduced to such a degree that thespring 30 will overcome the power exerted by the blow-out magnet andthus bring the contact terminals and 29 again into engagement. Assoon asthe contact terminals 28 and 29- come into engagement, a circuit willcompleted through the operating magnet 8 of the second switch, the

auxiliar switch )ertainin to switch con- .UlCt terminals 28 and 29 andthe main terminals l3 and 14 to the negative line conductor The maincontact terminals and auxiliary switch of the switch 6 will thus beclosed and the main circuit will be through .the motor, one-half theresistance l, the

blow-out coils and the main contact terminals of switch (3 to thenegative line conductor, the amount of current'thus caused to flowthrough ,the said blow-out coils being sufficient to draw the movablecore member 24; inward against the action of the spring and thusseparate the contact terminals 28 and 29, thereby delaying the operationof the switch 7 until the current-falls to such value auxiliary switch151317 closed, thus placing a suitable resistance 36L in circuit.

' As so in as the auxiliary switch 15'1819 maintained untilit is desiredto stop the mo' is .thus opened, the circuits of the operating magnetsof switches 5 and 6 will be opened, and, consequently, the movablemembers of vtheseswitches will drop and the blow-out m'gnets willperform their, functions of blowing" out the arcs which form betweenthem The closing of the contact member of the switch 7, serves to placeits blow-out. magnet in series with the motor and cuts theentire'starting resistance 4 out of circuit, this: being the-@peratingcondition which is -tor, which may, of course, be effected by na e- 1mgthe master switch 33.

Qofar as the e'peratlonand functions thus far described are concerned,the core member 24 of the switch 7 may be immovable,

' and the contact terminals 28 and 29 omitted,

and I desire it to be understood that my invention covers "the systemwhen so constructed and installed.

bince it. may sometimes be found desirable to employ an overload circuitbreaker inconnection with a motor-controlling system, 1 have providedtheswitch 7 with certain auxiliary devices whereby it may serve as anoverload circuit breaker, as wellas one unit of a motor cont-roller. Asshown, the

core member 2st is pivotally supported and I is normally held in itsoutermost position by the spring 30, which must be strong enough toresist every degree of magnetic pull which cur is'less than that causedby an overload rent in excess of what is allowable. The contact terminal28 is connected to the line conductor 3 and the cooperating contact te'ri'ninal 2 is connected to one terminal of the resistance member 34, sothat, when said contact terminals are separated by an excessive magneticpull upon the member 24:, the circuit of the coil 8 will be opened topermit the main contact terminals 13 and 14 to separate. i

in order to lock the core member 24in its innermost position, I providethe lug 31 with a projection 35 which is engaged by a pivotally mountedlatch 36 having a trip arm 37. main contact terminals of the switch 7after it has performed its cirdi'iitfbreakingfunction, a magnet winding38, which is connected across the line 2-3, through a normally openswitch 39, may be energized by closing said switch and, when soenergized, it will raise its coreor armature into engagement with thearm 37 and thus withdraw the latch 36 from the extension'35.

In order to effect closure of the.

It will be understood that the armatures 4 or movable core members forthe blow-out magnets may be movable otherwise than as shown anddescribed, and that the'circuits and the forms and relations of partsmay be varied within considerable limits without 7 departing from myinvention.

I claim as my invention:

1. The combination with a motor anda starting-resistance, of a series ofmain switches for removing successive sections of said resistance fromthe motor circuit, each of said main switches comprising an operatingcoil, a blow-out coil and an auxiliary switch, and all but one of saidmain switches being severally provided with movable armatures for theblow-out magnets which have means for making and'breaking the circuitsof t'he succeeding operating magnets. 2. The combination of a series ofmain.

switches having operating coils, blow-out coils, and auxiliaryswitches'f or making and breaking the circuits of the operating coils,

, ,of the operating coils offother switches in some of said mainswitches .being severally provided with movable blow-out coil armatureswhich 'have means for making and breaking the circuits of the operatingcoils of other switches in the-series.

. 3. A series of motor-controlling switches coils, blow-out coilsandauxiliary switches and some of which severally comprise movableblow-out coil "armatures which have means for making and breaking thecircuits the series.

' In a switch for electr1c-c1rcu1ts,'the combination with separablecontact termi- Y Y I x I nals, of a blow-out magnet therefor comprisinga winding and a movable armature or core for said blow-out'magnetwindmg.

5.; In a switch for electric circuits, thecombination with" separablecontact terminals, of a blow-out magnet-comprising two.

I ,coilsadjacent to said terminals and cores or armaturesfor said coilsone of which is mov'- able.

6. In a switch for electric circuits; the

combination with contact terminals and meansjfo'r actuating one of them,of a blowout magnet comprlsingtwocoils and cores .or armatures therefor,one .of which is movable and is providedwith an auxiliary contactterminal." 4

' "7. In a switch" for electriccircuits/the all of' which severallycomprise operatingfdr I said winding 8. In a switch for electriccircuits, the combination with separable contact terminals, and anoperating coil, of a, blow-out magnet comprising a winding and a movablearmature or core havingian auxiliary contact terminal, a cooperatingauxlllary.

contact terminal, a-latch for said movable armature or core, are-setting magnet and'a governing switch therefor. 9. In a switch forelectric circuits, the. combination with a stationary contact terminal,a movable contact: terminal, and an actuatingcoil for the latter, of ablow-out magnet winding adjacent-to said contact termi nals, aspring-restrained movable core or armature for said winding bearlng onecontact terminal of-avswit'ch in the circuit of'the main actuating coil,and means ,for locking and releasing said movable core or armature 10.In a switch for electric circuits, the

combination with a stationary contact. terminal, a movable contactterminal and a coil for actuating the latter, of a blow-out magnetwindingadjacent to said contact term1 nals, a spring-restrained core orarmature 7 that isv movable toward said contact terminals by saidwinding when energized in excess of a-predetermined de-' gree, a switchi the circuit of said actuating coil one membef-of which is supported bysaid core or armature, means for locking said 0 e or armature in itsmagnetically restraine position, and a manually controlled means forreleasing said core or armature.

In testimony whereof, I have hereunto subscribed my'name-this'28rd dayofNovember, 1908. Y I

. HENRY D. JAMES. Witnesses .FRANK M. J. lHURPHY,

BmivnY Hnvns.

